Numerical Study on Single-phase Flow and Heat Transfer Characteristics in Sinusoidal Wavy Microchannels
In order to analyze the single-phase flow and convective heat transfer characteristics in sinu-soidal wavy microchannels,numerical simulations were conducted to investigate the fluid flow and heat transfer characteristics of the coolant in sinusoidal wavy microchannels with wave amplitudes ranging from 125 to 500 μm,under inlet Reynolds numbers of 100 to 1 000.The research results indicate that an in-crease of wave amplitude and Reynolds number leads to an increase of flow pressure drop and friction fac-tor.Under the conditions of inlet Reynolds number Re of 400 and wave amplitude A from 125 to 500 μm,the flow pressure drop and friction factor increase to 3 and 2 times of the original values,re-spectively,significantly increasing the flow resistance.The larger wave amplitude enhances the flow and disturbance inside the flow channel,improving heat transfer efficiency;when the wave amplitude is 500 μm and Reynolds number increases from 100 to 1 000,the pressure drop,friction factor and the heat transfer coefficient increase by 50,10 and 5 times respectively.With the increase of Reynolds number,the flow velocity and friction factor of the coolant in the flow channel also increase.The stronger the flow disturbance,the higher the heat transfer coefficient.
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